Rollergun suggestions

[Fondueset]

If you look at a roller gun the wishbone is at rest right at the end of the barrel. So your band length will be determined by the distance between the resting position of the wishbone and the notch or fin on the shaft - in otherwords the distance you want the bands to stretch.

[Old Man Dave]

If the band measures 10 inches unloaded then it will measure 35 inches in the fully loaded position. This is easy with euro bands that are 2 single lengths that screw in at each end. Loop bands as favoured on american guns need a bit more calculation as you have to allow for the bit that fits through the front hole. They still strech to 3.5 times their length when loaded though. Roller guns need a bit of maths to work out as although the strech is 3.5 times it starts underneath the gun, runs forward and then back. The front anchor point for the bands under the gun is between 25% and 30% of the gun length back from the front. Any further back and the bands cannot fully unload on top and hit the nose (rollers) with too much force. Roller guns are usually short as you have to reach the very front of the gun to grasp the bands to load them.

Dave

[SpeerO]

Ok thanx fellaz! ill get this roller project rolling soon!!

Theres just a few bunch of guns in line before this

Oh.. another question just popped in my mind now... when putting the rollers do u put that bolt thru the wood directly or do u put some kind of sleeve into the wood then run the bolt thru that sleeve?




Zane...

[taziedevil11]

thanks...ok up to speed on the regular gun bands, and i would think you may be right on how the bands work with the rollers, it makes the most sence to me anyways...and ok speaking of rollers, do ya think there is a difference between mounting the rollers vertically or horizontally...most of the guns i have seen are vertically mounted. but i think the horizonally mounted rollers would offer a straiter trajectory.
ben

[foxfish]

Here is one I built a few months back.

[taziedevil11]

so found this italian speargun maker's website...beautiful guns. arbalegno home ....and i have another question...How thick of a band should i look for to use? ive seen thick and skinny bands and i want to know which one would work best for a rollergun....
ben